/***************************************************************************************************
 *Copyright(C),2010-2016,Sumscope
 *FileName	:  base64.cpp
 *Author	:  scofined.qi
 *Version	:  1.0
 *Date		:  2016/01/28
 *Desc		:  //用于主要说明此程序文件完成的主要功能
 *Relation :
 *Others	:  //其他内容说明
 *Function :  //主要函数列表，每条记录应包含函数名及功能简要说明
 *History	:
 * //修改历史记录列表，每条修改记录应包含修改日期、修改者及修改内容简介
 ***************************************************************************************************/
#include "base64.h"

// #ifdef _DEBUG
// #define new DEBUG_NEW
// #endif

namespace qb {
namespace base {

///////////////////////////////////////////////////////////////////////////////////
/// The usefull base64 encoder and decoder

#define MAXLINE 76

/*============================================================================
 * Everything below this line is private to this file (static)
 *============================================================================
 */

static char base64tab[] =
    "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    "abcdefghijklmnopqrstuvwxyz0123456789+/";

static char base64idx[128] = {
    '\377', '\377', '\377', '\377', '\377', '\377', '\377', '\377', '\377',
    '\377', '\377', '\377', '\377', '\377', '\377', '\377', '\377', '\377',
    '\377', '\377', '\377', '\377', '\377', '\377', '\377', '\377', '\377',
    '\377', '\377', '\377', '\377', '\377', '\377', '\377', '\377', '\377',
    '\377', '\377', '\377', '\377', '\377', '\377', '\377', 62,     '\377',
    '\377', '\377', 63,     52,     53,     54,     55,     56,     57,
    58,     59,     60,     61,     '\377', '\377', '\377', '\377', '\377',
    '\377', '\377', 0,      1,      2,      3,      4,      5,      6,
    7,      8,      9,      10,     11,     12,     13,     14,     15,
    16,     17,     18,     19,     20,     21,     22,     23,     24,
    25,     '\377', '\377', '\377', '\377', '\377', '\377', 26,     27,
    28,     29,     30,     31,     32,     33,     34,     35,     36,
    37,     38,     39,     40,     41,     42,     43,     44,     45,
    46,     47,     48,     49,     50,     51,     '\377', '\377', '\377',
    '\377', '\377'};

static char hextab[] = "0123456789ABCDEF";
static char eol_string[] = "\r\n";

#ifdef __cplusplus
inline int isbase64(int a) {
  return ('A' <= a && a <= 'Z') || ('a' <= a && a <= 'z') ||
         ('0' <= a && a <= '9') || a == '+' || a == '/';
}
#else
#define isbase64(a)                                            \
  (('A' <= (a) && (a) <= 'Z') || ('a' <= (a) && (a) <= 'z') || \
   ('0' <= (a) && (a) <= '9') || (a) == '+' || (a) == '/')
#endif

int Base64::Encode(const char* aIn, size_t aInLen, char* aOut, size_t aOutSize,
                   size_t* aOutLen) {
  size_t inLen = 0;
  char* out = 0;
  size_t outSize = 0;
  size_t inPos = 0;
  size_t outPos = 0;
  int c1, c2, c3;
  int lineLen = 0;
  size_t i;
  const char* cp = 0;

  if (!aIn || !aOut || !aOutLen) return -1;
  inLen = aInLen;
  out = aOut;
  outSize = (inLen + 2) / 3 * 4; /* 3:4 conversion ratio */
  outSize += strlen(eol_string) * outSize / MAXLINE +
             2; /* Space for newlines and NUL */
  if (aOutSize < outSize) return -1;

  /* Get three characters at a time and encode them. */
  for (i = 0; i < inLen / 3; ++i) {
    c1 = aIn[inPos++] & 0xFF;
    c2 = aIn[inPos++] & 0xFF;
    c3 = aIn[inPos++] & 0xFF;
    out[outPos++] = base64tab[(c1 & 0xFC) >> 2];
    out[outPos++] = base64tab[((c1 & 0x03) << 4) | ((c2 & 0xF0) >> 4)];
    out[outPos++] = base64tab[((c2 & 0x0F) << 2) | ((c3 & 0xC0) >> 6)];
    out[outPos++] = base64tab[c3 & 0x3F];
    lineLen += 4;
    if (lineLen >= MAXLINE - 3) {
      cp = eol_string;
      out[outPos++] = *cp++;
      if (*cp) {
        out[outPos++] = *cp;
      }
      lineLen = 0;
    }
  }
  /* Encode the remaining one or two characters. */
  switch (inLen % 3) {
    case 0:
      cp = eol_string;
      out[outPos++] = *cp++;
      if (*cp) {
        out[outPos++] = *cp;
      }
      break;
    case 1:
      c1 = aIn[inPos] & 0xFF;
      out[outPos++] = base64tab[(c1 & 0xFC) >> 2];
      out[outPos++] = base64tab[((c1 & 0x03) << 4)];
      out[outPos++] = '=';
      out[outPos++] = '=';
      cp = eol_string;
      out[outPos++] = *cp++;
      if (*cp) {
        out[outPos++] = *cp;
      }
      break;
    case 2:
      c1 = aIn[inPos++] & 0xFF;
      c2 = aIn[inPos] & 0xFF;
      out[outPos++] = base64tab[(c1 & 0xFC) >> 2];
      out[outPos++] = base64tab[((c1 & 0x03) << 4) | ((c2 & 0xF0) >> 4)];
      out[outPos++] = base64tab[((c2 & 0x0F) << 2)];
      out[outPos++] = '=';
      cp = eol_string;
      out[outPos++] = *cp++;
      if (*cp) {
        out[outPos++] = *cp;
      }
      break;
  }
  out[outPos] = 0;
  *aOutLen = outPos;
  return 0;
}

int Base64::Decode(const char* aIn, size_t aInLen, char* aOut, size_t aOutSize,
                   size_t* aOutLen) {
  size_t inLen = 0;
  char* out = 0;
  size_t outSize = 0;

  int isErr = 0;
  int isEndSeen = 0;
  int b1, b2, b3;
  int a1, a2, a3, a4;
  size_t inPos = 0;
  size_t outPos = 0;

  if (!aIn || !aOut || !aOutLen) return -1;
  inLen = aInLen;
  out = aOut;
  outSize = (inLen + 3) / 4 * 3;
  if (aOutSize < outSize) return -1;
  /* Get four input chars at a time and decode them. Ignore white space
   * chars (CR, LF, SP, HT). If '=' is encountered, terminate input. If
   * a char other than white space, base64 char, or '=' is encountered,
   * flag an input error, but otherwise ignore the char.
   */
  while (inPos < inLen) {
    a1 = a2 = a3 = a4 = 0;
    while (inPos < inLen) {
      a1 = aIn[inPos++] & 0xFF;
      if (isbase64(a1)) {
        break;
      } else if (a1 == '=') {
        isEndSeen = 1;
        break;
      } else if (a1 != '\r' && a1 != '\n' && a1 != ' ' && a1 != '\t') {
        isErr = 1;
      }
    }
    while (inPos < inLen) {
      a2 = aIn[inPos++] & 0xFF;
      if (isbase64(a2)) {
        break;
      } else if (a2 == '=') {
        isEndSeen = 1;
        break;
      } else if (a2 != '\r' && a2 != '\n' && a2 != ' ' && a2 != '\t') {
        isErr = 1;
      }
    }
    while (inPos < inLen) {
      a3 = aIn[inPos++] & 0xFF;
      if (isbase64(a3)) {
        break;
      } else if (a3 == '=') {
        isEndSeen = 1;
        break;
      } else if (a3 != '\r' && a3 != '\n' && a3 != ' ' && a3 != '\t') {
        isErr = 1;
      }
    }
    while (inPos < inLen) {
      a4 = aIn[inPos++] & 0xFF;
      if (isbase64(a4)) {
        break;
      } else if (a4 == '=') {
        isEndSeen = 1;
        break;
      } else if (a4 != '\r' && a4 != '\n' && a4 != ' ' && a4 != '\t') {
        isErr = 1;
      }
    }
    if (isbase64(a1) && isbase64(a2) && isbase64(a3) && isbase64(a4)) {
      a1 = base64idx[a1] & 0xFF;
      a2 = base64idx[a2] & 0xFF;
      a3 = base64idx[a3] & 0xFF;
      a4 = base64idx[a4] & 0xFF;
      b1 = ((a1 << 2) & 0xFC) | ((a2 >> 4) & 0x03);
      b2 = ((a2 << 4) & 0xF0) | ((a3 >> 2) & 0x0F);
      b3 = ((a3 << 6) & 0xC0) | (a4 & 0x3F);
      out[outPos++] = (char)(b1);
      out[outPos++] = (char)(b2);
      out[outPos++] = (char)(b3);
    } else if (isbase64(a1) && isbase64(a2) && isbase64(a3) && a4 == '=') {
      a1 = base64idx[a1] & 0xFF;
      a2 = base64idx[a2] & 0xFF;
      a3 = base64idx[a3] & 0xFF;
      b1 = ((a1 << 2) & 0xFC) | ((a2 >> 4) & 0x03);
      b2 = ((a2 << 4) & 0xF0) | ((a3 >> 2) & 0x0F);
      out[outPos++] = (char)(b1);
      out[outPos++] = (char)(b2);
      break;
    } else if (isbase64(a1) && isbase64(a2) && a3 == '=' && a4 == '=') {
      a1 = base64idx[a1] & 0xFF;
      a2 = base64idx[a2] & 0xFF;
      b1 = ((a1 << 2) & 0xFC) | ((a2 >> 4) & 0x03);
      out[outPos++] = (char)(b1);
      break;
    } else {
      break;
    }
    if (isEndSeen) {
      break;
    }
  } /* end while loop */
  *aOutLen = outPos;
  return (isErr) ? -1 : 0;
}

int Base64::Encode(const BaseString& strSrc, BaseString& strDest) {
  size_t destSize = 4 * (strSrc.size() + 2) / 3;
  destSize += strlen("\r\n") * destSize / 72 + 2;
  destSize += 64; /*64;  a little extra room */

  /* Allocate destination buffer */
  // OPTIMIZE:使用StackArray可以提高性能,see PipeMessagePtr::PipeMessagePtr
  char* destBuf = new char[destSize];  // strDest.GetBuffer(destSize);
  if (0 == destBuf) {
    // strDest.ReleaseBuffer();
    return 0;
  }

  /* Encode source to destination */
  size_t destLen = 0;
  int result =
      Encode(strSrc.c_str(), strSrc.size(), destBuf, destSize, &destLen);
  if (destLen < destSize) destBuf[destLen] = '\0';

  // strDest.ReleaseBuffer();
  strDest = destBuf;
  if (destBuf) delete[] destBuf;
  return strDest.size();
}

int Base64::Decode(const BaseString& strSrc, BaseString& strDest) {
  size_t destSize = 4 * (strSrc.size() + 2) / 3;
  destSize += strlen("\r\n") * destSize / 72 + 2;
  destSize += 64; /*64;  a little extra room */

  /* Allocate destination buffer */
  // OPTIMIZE:使用StackArray可以提高性能,see PipeMessagePtr::PipeMessagePtr
  char* destBuf = new char[destSize];  // strDest.GetBuffer(destSize);
  if (0 == destBuf) {
    // strDest.ReleaseBuffer();
    return 0;
  }

  /* Encode source to destination */
  size_t destLen = 0;
  int result =
      Decode(strSrc.c_str(), strSrc.size(), destBuf, destSize, &destLen);
  if (destLen < destSize) destBuf[destLen] = '\0';

  strDest = destBuf;
  if (destBuf) delete[] destBuf;
  return strDest.size();
}

//////////////////////////////////////////////////////////////////////////
// CRC32 and CRC16

static unsigned int crc_32_tab[] = {
    0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
    0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
    0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
    0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
    0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
    0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
    0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
    0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
    0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
    0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
    0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
    0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
    0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
    0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
    0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
    0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
    0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
    0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
    0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
    0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
    0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
    0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
    0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
    0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
    0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
    0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
    0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
    0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
    0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
    0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
    0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
    0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
    0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
    0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
    0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
    0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
    0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
    0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
    0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
    0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
    0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
    0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
    0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
    0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
    0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
    0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
    0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
    0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
    0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
    0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
    0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
    0x2d02ef8dL};

unsigned int Base64::CRC32(const char* s, int len) {
  register unsigned c;
  unsigned int crc = (unsigned int)0xffffffffL;

  if (s == 0) {
    c = 0xffffffffL;
  } else {
    c = crc;
    if (len) {
      do {
        c = crc_32_tab[((int)c ^ (*s++)) & 0xff] ^ (c >> 8);
      } while (--len);
    }
  }
  crc = c;
  return c ^ 0xffffffffL;
}

unsigned short Base64::CRC16(const unsigned char* info, unsigned long len) {
  unsigned short acc;
  unsigned char i;
  acc = 0;
  while (len--) {
    acc = acc ^ (((unsigned int)(*info)) << 8);
    info++;
    for (i = 8; i > 0; i--) {
      if (acc & 0x8000)
        acc = (acc << 1) ^ 0x1021;
      else
        acc <<= 1;
    }
  }
  return acc;
}

}  // namespace base
}  // namespace qb
